CVE-2026-12705

Device disablement via unverified firmware images

Published Jul 17, 2026 · Updated Jul 17, 2026

Firmware integrity bypass in ABB KNX Bus Update 2.0.175 and earlier allows physically proximate attackers to disable legacy KNX devices. The tool transfers tampered or intercepted firmware images because the classic KNX protocol provides no firmware-image integrity protection. Physical access to the connected KNX bus is required; modified firmware can stop a device or alter its behavior after reverse engineering.

CVSS severity5.9
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Firmware integrity bypass in ABB KNX Bus Update 2.0.175 and earlier allows physically proximate attackers to disable legacy KNX devices. The tool transfers tampered or intercepted firmware images because the classic KNX protocol provides no firmware-image integrity protection. Physical access to the connected KNX bus is required; modified firmware can stop a device or alter its behavior after reverse engineering.

The record

CVE
CVE-2026-12705
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
GENEREX SYSTEMS Computervertriebsgesellschaft mbH
Product
KNX Bus Update
Classifications
CWE-353, T1693.001
Attack vector
physical
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.0.175

What conditions does exploitation require?

Attack vectorphysical
Required privilegesUnavailable in this record.

What is affected?

GENEREX SYSTEMS Computervertriebsgesellschaft mbH · KNX Bus Updateversion=0 <=2.0.175

Published CVSS scores

6.3ABBCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H/E:F/RL:U/RC:C
6.4ABBCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
5.9ABBCVSS:4.0/AV:A/AC:H/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-353Missing Support for Integrity Check
T1693.001Modify Firmware: System Firmware

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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